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How can I reduce PDF file size without losing quality?

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Hi everyone,

I often work with PDF files that contain images and multiple pages, and sometimes the file size becomes too large to share by email or upload to websites.

What is the best way to reduce a PDF's file size in Adobe Acrobat while keeping the text clear and the images readable? Are there any recommended settings for balancing file size and quality?

Thanks for your help!

Amal JaiswalCorrect answer

Community Manager

Hi @Mick Judo

I hope you are doing well, and thanks for reaching out. Keeping text sharp and images readable while making a PDF small enough to email or upload is a common need, and Acrobat offers several supported ways to do so.

Reduced Size PDF (quickest): In Acrobat, go to Menu > Save as Other > Reduced Size PDF (on Mac, File > Save as Other > Reduced Size PDF). Choose the oldest Acrobat version your recipients can open under “Make compatible with”, then save. This creates a smaller copy and leaves your original unchanged.
Optimized PDF (more control): go to Save as Other > Optimized PDF and start with the Standard setting. If you need to adjust it, the Images panel controls downsampling and compression, and the Fonts panel controls font embedding. Try one change at a time and compare the result at the same zoom level.
Compress in Acrobat on the web: choose Convert > Compress a PDF, then pick High, Medium, or Low compression and download the file.

Note: For documents that will be professionally printed, it is a good idea to check with your print vendor before compressing, as stronger compression can lower print quality. Keeping a copy of the original file lets you compare the results.

For more information, please check the help pages listed below:
Optimize PDFs with PDF Optimizer in Acrobat
Compress PDFs online in Acrobat on the web

Let us know how it goes.

Regards,
Amal

E

epic_inventord40c

Participant

One extra check that helps is to test the compressed copy at 100 percent zoom on both a photo page and a small-text page before sharing it. If only the photos lose detail, lower the image downsampling in the optimizer rather than using a stronger overall compression setting, and keep the original file unchanged for printing.

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Peaceful_thinker692f

Participant

Here's what usually gives the best size-to-quality balance:

1. Quick option: File > Reduce File Size (or "Compress a PDF" in the newer UI). Try this first and check the result.
2. More control: File > Save As Other > Optimized PDF (PDF Optimizer). Then:
- Click "Audit space usage" first. It shows what is actually taking up the space. It's almost always the images.
- Images: downsample colour/greyscale images to about 150 ppi for screen/email (keep 300 if it will be printed). Use JPEG at Medium or High quality.
- Leave monochrome (scanned text) images at 300 ppi with CCITT/JBIG2 compression, so text stays crisp.
- Under "Discard Objects" and "Discard User Data", remove things you don't need, such as embedded thumbnails, comments and hidden layers.
- Leave fonts embedded. Unembedding saves little and can break the text.
3. Compress once from the best source you have. Compressing an already-compressed PDF again tends to make images soft without saving much.
4. If it's a scan, run it at a lower scan resolution (200–300 dpi) from the start. That makes a much bigger difference than compressing afterwards.

Always zoom to 100% on a page with small text and a photo before you send it.

(Disclosure: I run Pixel Print Co. If you ever need to do this without Acrobat, we have a free Compress PDF tool that runs in the browser and doesn't upload your file: https://pixelprintco.ca/pdf-tools/compress-pdf/)

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D

DFWTechGuy

Participating Frequently

You can try using Compress a PDF in Acrobat to reduce the file size. If you have access to the optimization settings, you can adjust image compression and resolution to find a good balance between file size and quality.

I’d avoid lowering the image resolution too much, especially if the PDF contains detailed images or scanned documents. It’s also a good idea to check the compressed file before sharing it to make sure the text and images are still clear.

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Amal Jaiswal

Correct answer

Community Manager

Hi @Mick Judo

I hope you are doing well, and thanks for reaching out. Keeping text sharp and images readable while making a PDF small enough to email or upload is a common need, and Acrobat offers several supported ways to do so.

Reduced Size PDF (quickest): In Acrobat, go to Menu > Save as Other > Reduced Size PDF (on Mac, File > Save as Other > Reduced Size PDF). Choose the oldest Acrobat version your recipients can open under “Make compatible with”, then save. This creates a smaller copy and leaves your original unchanged.
Optimized PDF (more control): go to Save as Other > Optimized PDF and start with the Standard setting. If you need to adjust it, the Images panel controls downsampling and compression, and the Fonts panel controls font embedding. Try one change at a time and compare the result at the same zoom level.
Compress in Acrobat on the web: choose Convert > Compress a PDF, then pick High, Medium, or Low compression and download the file.

Note: For documents that will be professionally printed, it is a good idea to check with your print vendor before compressing, as stronger compression can lower print quality. Keeping a copy of the original file lets you compare the results.

For more information, please check the help pages listed below:
Optimize PDFs with PDF Optimizer in Acrobat
Compress PDFs online in Acrobat on the web

Let us know how it goes.

Regards,
Amal

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